TY - JOUR
T1 - Localized Plasticity and Associated Cracking in Stable and Metastable High-Entropy Alloys Pre-Charged with Hydrogen
AU - Ichii, Kenshiro
AU - Koyama, Motomichi
AU - Tasan, Cemal Cem
AU - Tsuzaki, Kaneaki
N1 - Funding Information:
This work was financially supported by JSPS KAKENHI (JP16H06365 and JP17H04956) and the Japan Science and Technology Agency (JST) (grant number: 20100113) under Industry-Academia Collaborative R&D Program.
Publisher Copyright:
© 2018 The Authors.
PY - 2018
Y1 - 2018
N2 - We investigated hydrogen embrittlement in Fe20Mn20Ni20Cr20Co and Fe30Mn10Cr10Co (at.%) alloys pre-charged with 100 MPa hydrogen gas by tensile testing at three initial strain rates of 10 -4 , 10 -3 , and 10 -2 s -1 at ambient temperature. The alloys are classified as stable and metastable austenite-based high-entropy alloys (HEAs), respectively. Both HEAs showed the characteristic hydrogen-induced degradation of tensile ductility. Electron backscatter diffraction analysis indicated that the reduction in ductility by hydrogen pre-charging was associated with localized plasticity-assisted intergranular crack initiation. It should be noted as an important finding that hydrogen-assisted cracking of the metastable HEA occurred not through a brittle mechanism but through localized plastic deformation in both the austenite and ϵ-martensite phases.
AB - We investigated hydrogen embrittlement in Fe20Mn20Ni20Cr20Co and Fe30Mn10Cr10Co (at.%) alloys pre-charged with 100 MPa hydrogen gas by tensile testing at three initial strain rates of 10 -4 , 10 -3 , and 10 -2 s -1 at ambient temperature. The alloys are classified as stable and metastable austenite-based high-entropy alloys (HEAs), respectively. Both HEAs showed the characteristic hydrogen-induced degradation of tensile ductility. Electron backscatter diffraction analysis indicated that the reduction in ductility by hydrogen pre-charging was associated with localized plasticity-assisted intergranular crack initiation. It should be noted as an important finding that hydrogen-assisted cracking of the metastable HEA occurred not through a brittle mechanism but through localized plastic deformation in both the austenite and ϵ-martensite phases.
KW - Austenitic steels
KW - High-entropy alloy
KW - Hydrogen desorption
KW - Hydrogen embrittlement
KW - Martensitic transformation
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U2 - 10.1016/j.prostr.2018.12.119
DO - 10.1016/j.prostr.2018.12.119
M3 - Conference article
AN - SCOPUS:85063610243
SN - 2452-3216
VL - 13
SP - 716
EP - 721
JO - Procedia Structural Integrity
JF - Procedia Structural Integrity
T2 - 22nd European Conference on Fracture, ECF 2018
Y2 - 25 August 2018 through 26 August 2018
ER -